Boiler furnace and attachment



(No Model.) y 2 sheets-sheet 1.

R. Rf; ZELL.

BOILBR TURNAGE AND ATTACHMENT.

Patented Oct. 1'7, 1882.,

IH A mzllvl *WIT-MESSE: ,4 INN/ENTER* 2 Sheets-Sheet 2". R. R. ZELL. BOILER FURNAGE AND ATTACHMENT.

(No Model.)

Patented Oct. 17, 1882.

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UNTTnio STaTns PATBNT TTTQT..

ROBERT RIZELL, OF BALTIMORE, MARYLAND.

BOILER FURNACE AND ATTACHMENT.

SPECIFICATION forming part of Letters Patent No. 266,249, dated October 17, 1882, Application filed June 19, 1882. (No model.)

To all whom t may concern:

Be it known that I, ROBERT It. ZELL, of the city ofBaltimore and State of Maryland, have invented certain Improvements in Boiler-Furnaces and their Attachments, ot' which the following is the specification.

The object ot' this invention is to ett'ect a more thorough consumption of the products of imperfect combustion of fuel in a furnace than is usually obtained by means of existing devices.

'Ihe said invention, brieliy stated, consists in novel apparatus which is combined with the boilerand brick-workwhichsurroundsit,where by the products ofimperfect combustion offuel is taken from therear end of the boiler, combined with atmospheric air, and forced by means ofjcts of superheated steam to the spaces between the grate-bars, and thence through the burning fuel supported thereon.

In the further description of my invention which follows, reference is made to the accompanying drawings, forming a part hereof, and in which- Figure I is a partly-sectionalview ofa boiler provided with my improvements, the same being shown in perspective. Fig. II is a longitudinal section of the invention. Fig. III isa cross-section of Fig. I, taken on the dotted line :c y. Figs. IV, V, VI, and VII are -views of parts of the invention on an enlarged scale.

Similar letters of reference indicate similar parts in all the views.

A is the boiler, inclosed within and by the walls .B B. The boiler here shown is tired eX- teriorly, the products of combustion returning through tubes or lines to the front,'where they escape to a iiue or chimney.

Gis the furnace and D the bridge-wall, a large portion of which is constructed of short hollow blocks a, of terra-cotta, lire-brick, or other refractory material. The blocks are preferably cylindrical iu form, as shown in the drawings; but they may be of any other shape without affecting the nature of the invention.

E is a box extending transversely of the furnace and inclosed within thesolid .portion of the bridge-wall D. To the rear side of this box is attached a pipe, b, which extends to the back connection, F, where it is turned upward. A branch, c, connects the pipe b with the outer air, and it may be provided with a damper or valve, if desired.

A steam-pipe, G, leadsfrom the steamspace of the boiler to a pipe, H, inclosed in and running longitudinally of the box E. A portion of the pipe G under the boiler is formed into a 1 gang in order that the steam in passing to the pipe H may be superheated.

I I and K K are respectively hollow and solid grate-bars,theforinerhavingconical ends which tit into similar-shaped apertures in the box E. Fig. IV is a cross-sectional view of several ofthe bars I and K, showing their relative positions, and Fig. VI is a sectional plan of a partof the box E, showing how the bars enter the same. The pipe H is provided with aseries of nozzles, d, (shown on an enlarged scale in'Fig. VL) which are arranged opposite to each of the hollow bars I. These bars have lateral apertures or slots, @,which are protected gases, &c.,will readily escape through the said slots instead of passing with force to the end of the bars.

In the operation of this invention a jet of superheated steam is projected into each of the hollow bars I, and carries with it a mixture of gases and other products of imperfect combustion from the back connection through the pipe b, and atmospheric air through the branch c. A proper proportion ofthe products of imperfect combustion and air may be effected by means of valves, dampers, or other equivalent devices which are not shown in the drawings. The mixture of steam, gases, o., forced into the hollow grate-bars I, as before described, is projected through the lateral slots c to the body of burning coal on vthe bars, and carries with it air from the ash-pit, which is always open. The movement of gases, air, 85e., is indicated by arrows in the various figures.

It will be understood that by means of this invention the productsof imperfect combustion are reheated in passingthrough the bridge- Wall, then commingled with superheated steam and air, and then returned to the furnace in a condition for immediate ignition. InV employ- IOO ing an independent jet for each hollow gratebar a uniformity ot' pressure throughout the whole body of coal is attained, which would be impossible with any other construction.

I claim as my invention- 1. In combination with a box adapted as a bridge-wall or a part of a bridge-wall, having a series of openings therein in communication with its interior, a system of hollow grate-bars adapted to tit in the said openings, the said bars being closed at their upper; and lower t'aces and provided with lateral exit-apertures and apparatus for introducing' air to the interior ofthe said bridge-wall box, substantially as and for the purpose specified.

2. A box adapted asa bridge-wall or a part of a bridge-all having a series otl lateral apertures extending;` from its interior to receive the ends ot hollow grate-bars, a steam-pipe with nozzles opposite to the said opening, substantially as and for the purpose speeihed.

3. A box adapted as a bridge-wall ora part ot' a bridge-wall and having aseries ot' lateral apertures extending from its interior, and a system of hollow grate-bars connected with the said apertures, combined with a stemn-pipe having nozzles opposite to the said apertures, the said nozzles being removed from contact with the wall of the box and the said lateral apertures to form an exit-passage for the contents ofthe said box and an entrance-channel to the said hollow bars, substantially as and for the purpose speoitied.

4. In combination with a box adapted as a bridge-wall or a part of a bridge-wall and in communication with a system ot' hollow gratebars having,r lateral exit-apertures, a. supplypipe extending to a point under the boiler in the rear ot' the bridge-wall, substantially as and for the purpose specified.

5. 1n combination with a box adapted as a bridgewall or a part of a bridge-wall and in communication with a system ot' hollow gratebars having lateral exit-apertures, a supply pipe extending to a point under the boiler in the rear ot' the bridge-\vall, and a branch leading to the outer air, substantially as and for the purpose specified.

tOBERT R. ZELL. Vi tnesses:

WM. A. BARRi'rr, JOHN \VrLLIAMs. 

